What is Checkout 51? It is a cash back/rebate app. Offers are redeemed after you purchase the participating items within the valid dates and can be submitted through the app from your mobile device or even scanned from a computer. Once you reach $20, a check will be mailed to you. The best part is, you can also use coupons in the store to increase your savings!!! Every Thursday, there are new offers which you have until Wednesday of the following week to redeem.

*The cost per vitamin is $0.037 before the rebate. Costco also sells these at 275 ct for $11.99-$13.99 and has an instant $2 off coupon until May 1st. I grabbed some for $9.99 after $2 instant coupon – that is $0.363, so virtually the same cost! If you can submit the rebate, then I suggest grabbing these at Costco, because essentially you are getting more for FREE.